Air quality in Portsmouth, Ohio, United States of America today
Mr. Duck’s Air Quality Score
Moderate air today for Portsmouth, England, United Kingdom
This friendly indicator summarizes the latest city readings. For health guidance, please see: EPA AirNow or WHO.
Air quality today
The air quality in Portsmouth, Ohio is currently classified as Moderate. The primary pollutant identified is PM2.5 (fine particles). Measurements show a PM2.5 concentration of 30.7 µg/m³ and a PM10 level of 49.0 µg/m³ based on fifteen valid observations.
Data are shown via OpenAQ. This page is informational; for health guidance, use official sources such as EPA AirNow or WHO.
Latest sensor values
PM categories follow US EPA AQI breakpoints, shown here as an estimate derived from the latest valid measurements (this project does not compute EPA NowCast/24-hour AQI yet).
What the data includes
Portsmouth’s OpenAQ feed currently provides three pollutant measurements from a single monitoring site, Portsmouth Water Tre. The dataset includes PM10, fine particulate matter (PM2.5) and sulfur dioxide (SO₂). All three pollutants are represented by one row each, giving a total of three rows in the city‑wide collection.
The most recent data for the particulates were recorded on 2026-02-10 23:00 UTC, which falls within the last 30 days and is therefore considered current. Both PM10 and PM2.5 show identical statistics because each has only one observation: a minimum, median and maximum of 49.0 µg/m³ for PM10 and 30.7 µg/m³ for PM2.5. This means the typical value for each pollutant is exactly the same as its extreme values, indicating no observed variability in the limited sample.
In contrast, the SO₂ reading is much older, last updated on 2018-05-02 18:00 UTC. The single measurement records a concentration of 0.001 ppm, again with identical minimum, median and maximum because only one value exists. Because this data point is over eight years old, it does not reflect recent conditions and highlights an uneven temporal coverage across pollutants.
Overall, the city’s air‑quality picture is based on a very small number of observations—two recent rows for particulates and one legacy row for SO₂. With only one monitoring location contributing all values, spatial variation within Portsmouth cannot be captured, and the age disparity means that while particulate data are fresh, sulfur dioxide information is outdated. Users should keep in mind that conditions can differ across neighborhoods and over time beyond what this limited dataset shows.
Learn more about sources and filtering: About the data.
Trusted references: WHO (Air pollution) · US EPA AirNow · European Environment Agency (Air)
Latest sensor values (bars)
PM categories follow US EPA AQI breakpoints, shown here as an estimate derived from the latest valid measurements (this project does not compute EPA NowCast/24-hour AQI yet).
Data notes
The data shown reflects 15 valid measurements and is Updated within 3 days, with the most recent reading recorded at 2026‑02‑10T23:00:00+00:00. This snapshot represents conditions across Portsmouth, Ohio at a single point in time; air quality can differ by location and moment throughout the city, so values may not capture short‑term or neighborhood variations.
OpenAQ station rows
| Station | Parameter | Value | Unit | Last updated |
|---|---|---|---|---|
| Portsmouth Water Tre | pm10 | 49.0 | µg/m³ | 2026-02-10 23:00 UTC |
| Portsmouth Water Tre | pm25 | 30.7 | µg/m³ | 2026-02-10 23:00 UTC |
| Portsmouth Water Tre | so2 | 0.001 | ppm | 2018-05-02 18:00 UTC |